UKIP leader Nigel Farage told a court the pilot of a plane he was in when it crashed on election day threatened to kill him and had access to weapons.
The politician was giving evidence on the first day of the trial of Justin Adams at Oxford Crown Court.
Mr Adams denies threatening to kill Mr Farage and an air accident investigator six months after last May's crash.
Mr Adams, 45, of Faringdon, Oxfordshire, has pleaded not guilty to five counts of making threats to kill.
Mr Farage told the court: "He told me he had access to weapons and was going to kill me."
Mr Adams was flying the light aircraft which crashed into a field on 6 May - the 2010 general election day - with Mr Farage on board, after a publicity stunt went wrong.
The trial is expected to last several days.